Legal claims defining the scope of protection. Each claim is shown in both the original legal language and a plain English translation.
1. A method of performing hybrid automatic repeat request (HARQ) based on a polar code, the method comprising: generating, by a transmitter, response bits for a transport block received from a receiver; generating, by the transmitter, a codeword by encoding a predefined information bit with the polar code; and transmitting, by the transmitter, all or some bits of the codeword to the receiver through a physical channel, wherein the response bits are located at bits having high reliability among the predefined information bits, wherein a size of the codeword is determined to a value which supports a minimum code rate based on a number of the predefined information bits, and wherein, based on an amount of a radio resource used in transmission of the physical channel being variable, a number of all or some bits of the codeword is determined as below: (a number of the response bits)/(a code rate of the physical channel).
2. The method of claim 1 , wherein if an amount of a radio resource used in transmission of the physical channel is fixed, wherein the predefined information bit is an input bit of an encoder which performs encoding with the polar code, wherein the number of predefined information bits is K, wherein ‘a’ denotes a number of bits having the high reliability among the predefined information bits or the number of the response bits, and wherein ‘a’ is less than or equal to K.
This invention relates to wireless communication systems, specifically improving the reliability of data transmission using polar codes. The problem addressed is ensuring high reliability for critical information bits in transmissions where the radio resource allocation is fixed, such as in control channels or feedback signals. Polar codes are used for error correction, but some bits in the encoded output have higher reliability than others due to the code's channel polarization properties. The invention focuses on selecting and transmitting the most reliable bits to enhance the accuracy of decoded information. The method involves encoding predefined information bits using a polar code, where the number of information bits is K. Among these, a subset of bits (denoted as 'a') is identified as having high reliability. These high-reliability bits are prioritized for transmission, ensuring that critical data is more likely to be correctly decoded. The value of 'a' is constrained to be less than or equal to K, meaning the number of high-reliability bits cannot exceed the total number of information bits. This approach optimizes the use of fixed radio resources by focusing on the most reliable encoded bits, improving transmission efficiency and accuracy in scenarios with limited bandwidth. The method is particularly useful in systems where error-free transmission of certain bits is critical, such as in control signaling or feedback mechanisms.
3. The method of claim 2 , wherein a predefined value is transmitted in (K−a) bits excluding the bit having the high reliability among the predefined information bits.
A method for transmitting data with error resilience involves encoding predefined information bits into a codeword for transmission. The method ensures that at least one bit in the codeword has high reliability, meaning it is more likely to be correctly received even under noisy conditions. To achieve this, the predefined information bits are divided into two parts: one bit is selected to be highly reliable, and the remaining (K−a) bits are transmitted using fewer bits than the original number of bits. This reduction in bit count is possible because the highly reliable bit compensates for the loss of information, allowing the remaining bits to be encoded more efficiently. The method is particularly useful in communication systems where error correction is critical, such as wireless networks or digital broadcasting, where ensuring the integrity of certain key bits can improve overall data recovery. The technique balances redundancy and efficiency by prioritizing the reliability of specific bits while optimizing the transmission of the rest.
4. The method of claim 3 , wherein the predefined value is the same as 0, 1, a NACK information value, or a frozen bit.
5. The method of claim 2 , wherein the codeword is an output bit of an encoder which performs encoding with the polar code, wherein a value of a size of the codeword is N, and wherein the N is power of 2 or a combination of power of 2 and power of 3.
This invention relates to encoding techniques using polar codes, a type of error-correcting code used in digital communications. The problem addressed is the efficient generation of codewords in polar coding, particularly ensuring that the codeword size (N) is optimized for computational efficiency and performance. Polar codes are constructed by combining multiple copies of a basic kernel, and their performance depends on the codeword length and structure. The invention describes a method where the codeword is an output bit from an encoder that performs polar code encoding. The codeword size (N) is defined as a power of 2, a power of 3, or a combination of both. This constraint ensures that the codeword length is compatible with efficient hardware implementations, as powers of 2 and 3 simplify circuit design and reduce computational complexity. The method leverages the properties of polar codes, where the codeword length influences the error-correction capability and decoding complexity. By restricting N to these specific values, the encoding process becomes more predictable and easier to optimize for real-world applications, such as wireless communication systems or data storage. The approach improves encoding efficiency while maintaining reliable error correction.
6. The method of claim 5 , wherein the N is greater than the K, and the frozen bit is encoded with the polar code together with the predefined information bit, and wherein a number of frozen bits is N−K.
A method for encoding data using polar codes involves transmitting information bits along with frozen bits, where the number of frozen bits (N−K) is greater than the number of information bits (K). The frozen bits include a predefined information bit and at least one additional frozen bit. The predefined information bit is encoded as part of the polar code, ensuring it is transmitted alongside the information bits. This approach enhances error correction by leveraging the structured nature of polar codes, where frozen bits are used to improve reliability. The method is particularly useful in communication systems requiring robust error handling, such as wireless networks or data storage applications. By encoding the predefined information bit within the polar code, the system can maintain consistency and detect errors more effectively. The technique optimizes the use of frozen bits, balancing redundancy and efficiency to improve overall transmission reliability.
7. A transmitter performing hybrid automatic repeat request (HARQ) based on a polar code, the transmitter comprising: a radio frequency (RF) unit that transmits and receives a radio signal; and a processor controlling the RF unit, wherein the processor is configured to: generate response bits for a transport block received from a receiver; generate a codeword by encoding a predefined information bit with the polar code; and transmit all or some bits of the codeword to the receiver through a physical channel, wherein the response bits are located at bits having high reliability among the predefined information bits, wherein a size of the codeword is determined to a value which supports a minimum code rate based on a number of the predefined information bits, and wherein, based on an amount of a radio resource used in transmission of the physical channel being variable, a number of all or some bits of the codeword is determined as below: (a number of the response bits)/(a code rate of the physical channel).
This invention relates to wireless communication systems using hybrid automatic repeat request (HARQ) with polar codes. The problem addressed is efficiently transmitting response bits for a transport block while optimizing resource usage in variable radio conditions. The transmitter includes an RF unit for signal transmission and reception, and a processor that generates response bits for a received transport block. The processor encodes predefined information bits using a polar code to produce a codeword, where the response bits are placed in high-reliability positions within the codeword. The codeword size is set to support a minimum code rate based on the number of predefined information bits. The number of bits transmitted from the codeword is dynamically adjusted based on the available radio resources, calculated as the ratio of the response bit count to the physical channel's code rate. This ensures efficient use of variable radio resources while maintaining reliable transmission of response bits. The system adapts to changing channel conditions by dynamically determining the number of bits to transmit, optimizing both reliability and resource utilization.
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January 19, 2021
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